<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <!-- 改变函数内部的this关键字的指向 -->
    <script>
    
        var name="yuan";
        var obj={
            name:'li'
            
        }
        // bind()改变了函数执行的上文环境
        var test=function(){
            console.log(this.name)
        }.bind(obj);
        test()
    </script>
</body>
</html>